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Article: Optimal and robust design of docking blocks with uncertainty

TitleOptimal and robust design of docking blocks with uncertainty
Authors
KeywordsConvex model
Docking blocks
Optimal design
Robust design
Uncertainty
Issue Date2004
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/engstruct
Citation
Engineering Structures, 2004, v. 26 n. 4, p. 499-510 How to Cite?
AbstractThe positioning and stiffness allocation of docking blocks are an important decision when docking a ship. In this paper, the issues of both optimal design and robust design of docking blocks with uncertainty are discussed, and the corresponding mathematical models are proposed. To describe the uncertainties of various parameters, the proposed method employs the convex model in which the indeterminacy about the uncertain variables is expressed in terms of some sets to which these uncertain variables belong. In the optimisation of docking blocks, the factors considered include the uncertain ship girder loads and uncertain equivalent stiffnesses of blocks. Numerical examples show that uncertainties do affect the optimal solution and lead to an increase in volume of blocks compared to that from deterministic optimisation. A method of robust design with respect to the uncertain equivalent stiffnesses of blocks is also proposed. The robustness of the objective function is achieved by minimising the maximum value of unsatisfactory degree functions of the uncertainty parameters while the feasibility robustness is ensured by an optimisation conducting the worst-case analysis at a lower level. Numerical simulations show that the optimal result from minimisation of the maximum value of unsatisfactory degree functions is superior to that from direct maximisation of the minimum value of uncertainty parameters without the use of unsatisfactory degree functions. © 2003 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/71158
ISSN
2015 Impact Factor: 1.893
2015 SCImago Journal Rankings: 1.813
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorCheng, YSen_HK
dc.contributor.authorAu, FTKen_HK
dc.contributor.authorTham, LGen_HK
dc.contributor.authorZeng, GWen_HK
dc.date.accessioned2010-09-06T06:29:26Z-
dc.date.available2010-09-06T06:29:26Z-
dc.date.issued2004en_HK
dc.identifier.citationEngineering Structures, 2004, v. 26 n. 4, p. 499-510en_HK
dc.identifier.issn0141-0296en_HK
dc.identifier.urihttp://hdl.handle.net/10722/71158-
dc.description.abstractThe positioning and stiffness allocation of docking blocks are an important decision when docking a ship. In this paper, the issues of both optimal design and robust design of docking blocks with uncertainty are discussed, and the corresponding mathematical models are proposed. To describe the uncertainties of various parameters, the proposed method employs the convex model in which the indeterminacy about the uncertain variables is expressed in terms of some sets to which these uncertain variables belong. In the optimisation of docking blocks, the factors considered include the uncertain ship girder loads and uncertain equivalent stiffnesses of blocks. Numerical examples show that uncertainties do affect the optimal solution and lead to an increase in volume of blocks compared to that from deterministic optimisation. A method of robust design with respect to the uncertain equivalent stiffnesses of blocks is also proposed. The robustness of the objective function is achieved by minimising the maximum value of unsatisfactory degree functions of the uncertainty parameters while the feasibility robustness is ensured by an optimisation conducting the worst-case analysis at a lower level. Numerical simulations show that the optimal result from minimisation of the maximum value of unsatisfactory degree functions is superior to that from direct maximisation of the minimum value of uncertainty parameters without the use of unsatisfactory degree functions. © 2003 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/engstructen_HK
dc.relation.ispartofEngineering Structuresen_HK
dc.subjectConvex modelen_HK
dc.subjectDocking blocksen_HK
dc.subjectOptimal designen_HK
dc.subjectRobust designen_HK
dc.subjectUncertaintyen_HK
dc.titleOptimal and robust design of docking blocks with uncertaintyen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0141-0296&volume=26&spage=499&epage=510&date=2004&atitle=Optimal+and+robust+design+of+docking+blocks+with+uncertaintyen_HK
dc.identifier.emailAu, FTK:francis.au@hku.hken_HK
dc.identifier.emailTham, LG:hrectlg@hkucc.hku.hken_HK
dc.identifier.authorityAu, FTK=rp00083en_HK
dc.identifier.authorityTham, LG=rp00176en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.engstruct.2003.11.007en_HK
dc.identifier.scopuseid_2-s2.0-1442338345en_HK
dc.identifier.hkuros93032en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-1442338345&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume26en_HK
dc.identifier.issue4en_HK
dc.identifier.spage499en_HK
dc.identifier.epage510en_HK
dc.identifier.isiWOS:000220048000007-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridCheng, YS=7404911293en_HK
dc.identifier.scopusauthoridAu, FTK=7005204072en_HK
dc.identifier.scopusauthoridTham, LG=7006213628en_HK
dc.identifier.scopusauthoridZeng, GW=7202802813en_HK

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